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[apple/xnu.git] / osfmk / ddb / db_access.c
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1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22/*
23 * @OSF_COPYRIGHT@
24 */
25/*
26 * Mach Operating System
27 * Copyright (c) 1991,1990 Carnegie Mellon University
28 * All Rights Reserved.
29 *
30 * Permission to use, copy, modify and distribute this software and its
31 * documentation is hereby granted, provided that both the copyright
32 * notice and this permission notice appear in all copies of the
33 * software, derivative works or modified versions, and any portions
34 * thereof, and that both notices appear in supporting documentation.
35 *
36 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39 *
40 * Carnegie Mellon requests users of this software to return to
41 *
42 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
43 * School of Computer Science
44 * Carnegie Mellon University
45 * Pittsburgh PA 15213-3890
46 *
47 * any improvements or extensions that they make and grant Carnegie Mellon
48 * the rights to redistribute these changes.
49 */
50/*
51 */
52/*
53 * Author: David B. Golub, Carnegie Mellon University
54 * Date: 7/90
55 */
56#include <mach/boolean.h>
57#include <machine/db_machdep.h> /* type definitions */
58#include <machine/setjmp.h>
59#include <machine/endian.h>
60#include <kern/task.h>
61#include <ddb/db_access.h>
62
63
64
65/*
66 * Access unaligned data items on aligned (longword)
67 * boundaries.
68 */
69
70int db_access_level = DB_ACCESS_LEVEL;
71
72db_expr_t
73db_get_task_value(
74 db_addr_t addr,
75 register int size,
76 boolean_t is_signed,
77 task_t task)
78{
79 char data[sizeof(db_expr_t)];
80 register db_expr_t value;
81 register int i;
82 uint64_t signx;
83
84 if(size == 0) return 0;
85
86 db_read_bytes((vm_offset_t)addr, size, data, task);
87
88 value = 0;
89#if BYTE_MSF
90 for (i = 0; i < size; i++)
91#else /* BYTE_LSF */
92 for (i = size - 1; i >= 0; i--)
93#endif
94 {
95 value = (value << 8) + (data[i] & 0xFF);
96 }
97
98 if(!is_signed) return value;
99
100 signx = 0xFFFFFFFFFFFFFFFFULL << ((size << 3) - 1);
101
102 if(value & signx) value |= signx; /* Add 1s to front if sign bit is on */
103
104 return (value);
105}
106
107void
108db_put_task_value(
109 db_addr_t addr,
110 register int size,
111 register db_expr_t value,
112 task_t task)
113{
114 char data[sizeof(db_expr_t)];
115 register int i;
116
117#if BYTE_MSF
118 for (i = size - 1; i >= 0; i--)
119#else /* BYTE_LSF */
120 for (i = 0; i < size; i++)
121#endif
122 {
123 data[i] = value & 0xFF;
124 value >>= 8;
125 }
126
127 db_write_bytes((vm_offset_t)addr, size, data, task);
128}
129
130db_expr_t
131db_get_value(
132 db_addr_t addr,
133 int size,
134 boolean_t is_signed)
135{
136 return(db_get_task_value(addr, size, is_signed, TASK_NULL));
137}
138
139void
140db_put_value(
141 db_addr_t addr,
142 int size,
143 db_expr_t value)
144{
145 db_put_task_value(addr, size, value, TASK_NULL);
146}